Kim(55 kg) has been wondering about the normal force.

(a) How many helium balloons would it take to reduce her normal force by 50% if helium has a lifting force of 1.0 gram per liter. She estimates that a balloon contains about 5.0 liters of helium.
(b) How many helium balloons would it take to achieve the same result on the Moon where the acceleration due to gravity is only 1/6th of the acceleration due to gravity on Earth (assume everything else is the same)

27.5 = x .005

BTW this question is bad. Force is certainly not measure in grams nor grams per liter.